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1da177e4 LT |
1 | /* |
2 | * max1619.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
4 | * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru> | |
5 | * Jean Delvare <khali@linux-fr.org> | |
6 | * | |
7 | * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. | |
8 | * It reports up to two temperatures (its own plus up to | |
9 | * one external one). Complete datasheet can be | |
10 | * obtained from Maxim's website at: | |
11 | * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | ||
29 | #include <linux/config.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/i2c.h> | |
35 | #include <linux/i2c-sensor.h> | |
36 | ||
37 | ||
38 | static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a, | |
39 | 0x29, 0x2a, 0x2b, | |
40 | 0x4c, 0x4d, 0x4e, | |
41 | I2C_CLIENT_END }; | |
42 | static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; | |
43 | ||
44 | /* | |
45 | * Insmod parameters | |
46 | */ | |
47 | ||
48 | SENSORS_INSMOD_1(max1619); | |
49 | ||
50 | /* | |
51 | * The MAX1619 registers | |
52 | */ | |
53 | ||
54 | #define MAX1619_REG_R_MAN_ID 0xFE | |
55 | #define MAX1619_REG_R_CHIP_ID 0xFF | |
56 | #define MAX1619_REG_R_CONFIG 0x03 | |
57 | #define MAX1619_REG_W_CONFIG 0x09 | |
58 | #define MAX1619_REG_R_CONVRATE 0x04 | |
59 | #define MAX1619_REG_W_CONVRATE 0x0A | |
60 | #define MAX1619_REG_R_STATUS 0x02 | |
61 | #define MAX1619_REG_R_LOCAL_TEMP 0x00 | |
62 | #define MAX1619_REG_R_REMOTE_TEMP 0x01 | |
63 | #define MAX1619_REG_R_REMOTE_HIGH 0x07 | |
64 | #define MAX1619_REG_W_REMOTE_HIGH 0x0D | |
65 | #define MAX1619_REG_R_REMOTE_LOW 0x08 | |
66 | #define MAX1619_REG_W_REMOTE_LOW 0x0E | |
67 | #define MAX1619_REG_R_REMOTE_CRIT 0x10 | |
68 | #define MAX1619_REG_W_REMOTE_CRIT 0x12 | |
69 | #define MAX1619_REG_R_TCRIT_HYST 0x11 | |
70 | #define MAX1619_REG_W_TCRIT_HYST 0x13 | |
71 | ||
72 | /* | |
73 | * Conversions and various macros | |
74 | */ | |
75 | ||
76 | #define TEMP_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000) | |
77 | #define TEMP_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000) | |
78 | ||
79 | /* | |
80 | * Functions declaration | |
81 | */ | |
82 | ||
83 | static int max1619_attach_adapter(struct i2c_adapter *adapter); | |
84 | static int max1619_detect(struct i2c_adapter *adapter, int address, | |
85 | int kind); | |
86 | static void max1619_init_client(struct i2c_client *client); | |
87 | static int max1619_detach_client(struct i2c_client *client); | |
88 | static struct max1619_data *max1619_update_device(struct device *dev); | |
89 | ||
90 | /* | |
91 | * Driver data (common to all clients) | |
92 | */ | |
93 | ||
94 | static struct i2c_driver max1619_driver = { | |
95 | .owner = THIS_MODULE, | |
96 | .name = "max1619", | |
97 | .flags = I2C_DF_NOTIFY, | |
98 | .attach_adapter = max1619_attach_adapter, | |
99 | .detach_client = max1619_detach_client, | |
100 | }; | |
101 | ||
102 | /* | |
103 | * Client data (each client gets its own) | |
104 | */ | |
105 | ||
106 | struct max1619_data { | |
107 | struct i2c_client client; | |
108 | struct semaphore update_lock; | |
109 | char valid; /* zero until following fields are valid */ | |
110 | unsigned long last_updated; /* in jiffies */ | |
111 | ||
112 | /* registers values */ | |
113 | u8 temp_input1; /* local */ | |
114 | u8 temp_input2, temp_low2, temp_high2; /* remote */ | |
115 | u8 temp_crit2; | |
116 | u8 temp_hyst2; | |
117 | u8 alarms; | |
118 | }; | |
119 | ||
120 | /* | |
121 | * Sysfs stuff | |
122 | */ | |
123 | ||
124 | #define show_temp(value) \ | |
125 | static ssize_t show_##value(struct device *dev, char *buf) \ | |
126 | { \ | |
127 | struct max1619_data *data = max1619_update_device(dev); \ | |
128 | return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ | |
129 | } | |
130 | show_temp(temp_input1); | |
131 | show_temp(temp_input2); | |
132 | show_temp(temp_low2); | |
133 | show_temp(temp_high2); | |
134 | show_temp(temp_crit2); | |
135 | show_temp(temp_hyst2); | |
136 | ||
137 | #define set_temp2(value, reg) \ | |
138 | static ssize_t set_##value(struct device *dev, const char *buf, \ | |
139 | size_t count) \ | |
140 | { \ | |
141 | struct i2c_client *client = to_i2c_client(dev); \ | |
142 | struct max1619_data *data = i2c_get_clientdata(client); \ | |
143 | long val = simple_strtol(buf, NULL, 10); \ | |
144 | \ | |
145 | down(&data->update_lock); \ | |
146 | data->value = TEMP_TO_REG(val); \ | |
147 | i2c_smbus_write_byte_data(client, reg, data->value); \ | |
148 | up(&data->update_lock); \ | |
149 | return count; \ | |
150 | } | |
151 | ||
152 | set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW); | |
153 | set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH); | |
154 | set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT); | |
155 | set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST); | |
156 | ||
157 | static ssize_t show_alarms(struct device *dev, char *buf) | |
158 | { | |
159 | struct max1619_data *data = max1619_update_device(dev); | |
160 | return sprintf(buf, "%d\n", data->alarms); | |
161 | } | |
162 | ||
163 | static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); | |
164 | static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); | |
165 | static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, | |
166 | set_temp_low2); | |
167 | static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, | |
168 | set_temp_high2); | |
169 | static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, | |
170 | set_temp_crit2); | |
171 | static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2, | |
172 | set_temp_hyst2); | |
173 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); | |
174 | ||
175 | /* | |
176 | * Real code | |
177 | */ | |
178 | ||
179 | static int max1619_attach_adapter(struct i2c_adapter *adapter) | |
180 | { | |
181 | if (!(adapter->class & I2C_CLASS_HWMON)) | |
182 | return 0; | |
183 | return i2c_detect(adapter, &addr_data, max1619_detect); | |
184 | } | |
185 | ||
186 | /* | |
187 | * The following function does more than just detection. If detection | |
188 | * succeeds, it also registers the new chip. | |
189 | */ | |
190 | static int max1619_detect(struct i2c_adapter *adapter, int address, int kind) | |
191 | { | |
192 | struct i2c_client *new_client; | |
193 | struct max1619_data *data; | |
194 | int err = 0; | |
195 | const char *name = ""; | |
196 | u8 reg_config=0, reg_convrate=0, reg_status=0; | |
197 | u8 man_id, chip_id; | |
198 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
199 | goto exit; | |
200 | ||
201 | if (!(data = kmalloc(sizeof(struct max1619_data), GFP_KERNEL))) { | |
202 | err = -ENOMEM; | |
203 | goto exit; | |
204 | } | |
205 | memset(data, 0, sizeof(struct max1619_data)); | |
206 | ||
207 | /* The common I2C client data is placed right before the | |
208 | MAX1619-specific data. */ | |
209 | new_client = &data->client; | |
210 | i2c_set_clientdata(new_client, data); | |
211 | new_client->addr = address; | |
212 | new_client->adapter = adapter; | |
213 | new_client->driver = &max1619_driver; | |
214 | new_client->flags = 0; | |
215 | ||
216 | /* | |
217 | * Now we do the remaining detection. A negative kind means that | |
218 | * the driver was loaded with no force parameter (default), so we | |
219 | * must both detect and identify the chip. A zero kind means that | |
220 | * the driver was loaded with the force parameter, the detection | |
221 | * step shall be skipped. A positive kind means that the driver | |
222 | * was loaded with the force parameter and a given kind of chip is | |
223 | * requested, so both the detection and the identification steps | |
224 | * are skipped. | |
225 | */ | |
226 | if (kind < 0) { /* detection */ | |
227 | reg_config = i2c_smbus_read_byte_data(new_client, | |
228 | MAX1619_REG_R_CONFIG); | |
229 | reg_convrate = i2c_smbus_read_byte_data(new_client, | |
230 | MAX1619_REG_R_CONVRATE); | |
231 | reg_status = i2c_smbus_read_byte_data(new_client, | |
232 | MAX1619_REG_R_STATUS); | |
233 | if ((reg_config & 0x03) != 0x00 | |
234 | || reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) { | |
235 | dev_dbg(&adapter->dev, | |
236 | "MAX1619 detection failed at 0x%02x.\n", | |
237 | address); | |
238 | goto exit_free; | |
239 | } | |
240 | } | |
241 | ||
242 | if (kind <= 0) { /* identification */ | |
243 | ||
244 | man_id = i2c_smbus_read_byte_data(new_client, | |
245 | MAX1619_REG_R_MAN_ID); | |
246 | chip_id = i2c_smbus_read_byte_data(new_client, | |
247 | MAX1619_REG_R_CHIP_ID); | |
248 | ||
249 | if ((man_id == 0x4D) && (chip_id == 0x04)){ | |
250 | kind = max1619; | |
251 | } | |
252 | } | |
253 | ||
254 | if (kind <= 0) { /* identification failed */ | |
255 | dev_info(&adapter->dev, | |
256 | "Unsupported chip (man_id=0x%02X, " | |
257 | "chip_id=0x%02X).\n", man_id, chip_id); | |
258 | goto exit_free; | |
259 | } | |
260 | ||
261 | ||
262 | if (kind == max1619){ | |
263 | name = "max1619"; | |
264 | } | |
265 | ||
266 | /* We can fill in the remaining client fields */ | |
267 | strlcpy(new_client->name, name, I2C_NAME_SIZE); | |
268 | data->valid = 0; | |
269 | init_MUTEX(&data->update_lock); | |
270 | ||
271 | /* Tell the I2C layer a new client has arrived */ | |
272 | if ((err = i2c_attach_client(new_client))) | |
273 | goto exit_free; | |
274 | ||
275 | /* Initialize the MAX1619 chip */ | |
276 | max1619_init_client(new_client); | |
277 | ||
278 | /* Register sysfs hooks */ | |
279 | device_create_file(&new_client->dev, &dev_attr_temp1_input); | |
280 | device_create_file(&new_client->dev, &dev_attr_temp2_input); | |
281 | device_create_file(&new_client->dev, &dev_attr_temp2_min); | |
282 | device_create_file(&new_client->dev, &dev_attr_temp2_max); | |
283 | device_create_file(&new_client->dev, &dev_attr_temp2_crit); | |
284 | device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst); | |
285 | device_create_file(&new_client->dev, &dev_attr_alarms); | |
286 | ||
287 | return 0; | |
288 | ||
289 | exit_free: | |
290 | kfree(data); | |
291 | exit: | |
292 | return err; | |
293 | } | |
294 | ||
295 | static void max1619_init_client(struct i2c_client *client) | |
296 | { | |
297 | u8 config; | |
298 | ||
299 | /* | |
300 | * Start the conversions. | |
301 | */ | |
302 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE, | |
303 | 5); /* 2 Hz */ | |
304 | config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG); | |
305 | if (config & 0x40) | |
306 | i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG, | |
307 | config & 0xBF); /* run */ | |
308 | } | |
309 | ||
310 | static int max1619_detach_client(struct i2c_client *client) | |
311 | { | |
312 | int err; | |
313 | ||
314 | if ((err = i2c_detach_client(client))) { | |
315 | dev_err(&client->dev, "Client deregistration failed, " | |
316 | "client not detached.\n"); | |
317 | return err; | |
318 | } | |
319 | ||
320 | kfree(i2c_get_clientdata(client)); | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static struct max1619_data *max1619_update_device(struct device *dev) | |
325 | { | |
326 | struct i2c_client *client = to_i2c_client(dev); | |
327 | struct max1619_data *data = i2c_get_clientdata(client); | |
328 | ||
329 | down(&data->update_lock); | |
330 | ||
331 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { | |
332 | dev_dbg(&client->dev, "Updating max1619 data.\n"); | |
333 | data->temp_input1 = i2c_smbus_read_byte_data(client, | |
334 | MAX1619_REG_R_LOCAL_TEMP); | |
335 | data->temp_input2 = i2c_smbus_read_byte_data(client, | |
336 | MAX1619_REG_R_REMOTE_TEMP); | |
337 | data->temp_high2 = i2c_smbus_read_byte_data(client, | |
338 | MAX1619_REG_R_REMOTE_HIGH); | |
339 | data->temp_low2 = i2c_smbus_read_byte_data(client, | |
340 | MAX1619_REG_R_REMOTE_LOW); | |
341 | data->temp_crit2 = i2c_smbus_read_byte_data(client, | |
342 | MAX1619_REG_R_REMOTE_CRIT); | |
343 | data->temp_hyst2 = i2c_smbus_read_byte_data(client, | |
344 | MAX1619_REG_R_TCRIT_HYST); | |
345 | data->alarms = i2c_smbus_read_byte_data(client, | |
346 | MAX1619_REG_R_STATUS); | |
347 | ||
348 | data->last_updated = jiffies; | |
349 | data->valid = 1; | |
350 | } | |
351 | ||
352 | up(&data->update_lock); | |
353 | ||
354 | return data; | |
355 | } | |
356 | ||
357 | static int __init sensors_max1619_init(void) | |
358 | { | |
359 | return i2c_add_driver(&max1619_driver); | |
360 | } | |
361 | ||
362 | static void __exit sensors_max1619_exit(void) | |
363 | { | |
364 | i2c_del_driver(&max1619_driver); | |
365 | } | |
366 | ||
367 | MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and" | |
368 | "Jean Delvare <khali@linux-fr.org>"); | |
369 | MODULE_DESCRIPTION("MAX1619 sensor driver"); | |
370 | MODULE_LICENSE("GPL"); | |
371 | ||
372 | module_init(sensors_max1619_init); | |
373 | module_exit(sensors_max1619_exit); |